do not drink alcohol in excess with cialis. side effects may include headache, upset stomach, delayed backache or muscle ache. to avoid long-term injury, seek immediate medical help for an erection lasting more than 4 hours. if you have any sudden decrease or loss in hearing or vision, or if you have any allergic reactions such as rash, hives, swelling of the lips, tongue or throat, or difficulty breathing or swallowing, stop taking cialis and get medical help right away. ask your doctor about cialis for daily use and a 30-tablet free trial. >>> in today's yahoo! finance question of the day, how are you approaching your retail shopping this year. 32% say you're finished, i hate you. 35% have started but have to do more. 33% say i'm waiting, i think there are better deals to come. let's see what's coming up on "street signs." welcome back, mandy drury from down under. >> it's great to be back. hi, ty. hi, everybody, coming up at the top of the hour on "street signs," so who loses if bitcoin succeeds? and we asked you last week,